单项选择题
On which Network Elements are firewalls typically connected in LTE？（）
A.MME and PGW.
B.OSS and VAS.
C.SGW and PGW.
D.OSS and DPI.
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单项选择题
A.MME and PGW.
B.OSS and VAS.
C.SGW and PGW.
D.OSS and DPI.
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